﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Collections.Specialized;
using System.Threading.Tasks;
using System.IO;
using System.Runtime.InteropServices;
using System.Windows.Forms;

namespace Instrument
{
    /// <summary>
    /// IniFiles的类
    /// </summary>
    public class IniFiles
    {
        public string FileName; //Ini 文件名
        //string path = System.IO.Path.Combine(Application.StartupPath, "pos.ini");
        //声明读写Ini文件的API函数
        [DllImport("kernel32")]
        private static extern bool WritePrivateProfileString(string section, string key, string val, string filePath);
        [DllImport("kernel32")]
        private static extern int GetPrivateProfileString(string section, string key, string val, byte[] retVal, int size, string filePath);
        //类的构造函数，传递Ini文件名
        public IniFiles(string AFileName)
        {
            //判断文件是否存在
            FileInfo fileInfo = new FileInfo(AFileName);
            //Todo:搞清枚举的用法
            if (!fileInfo.Exists)
            {//||(FileAttributes.Directory in fileInfo.Attributes))
                //文件不存在，建立文件
                System.IO.StreamWriter sw = new System.IO.StreamWriter(AFileName, false, System.Text.Encoding.Default);
                try
                {
                    sw.Write("#ini文件");
                    sw.Close();
                }
                catch
                {
                    throw (new ApplicationException("Ini文件不存在"));
                }
            }
            //必须是完全路径，不能是相对路径
            FileName = fileInfo.FullName;
        }
        //写Ini文件
        public void WriteString(string Section, string Key, string Value)
        {
            if (!WritePrivateProfileString(Section, Key, Value, FileName))
                throw (new ApplicationException("写Ini文件错误"));
        }
        //读取指定键值对
        public string ReadString(string Section, string Key, string Default)
        {
            Byte[] Buffer = new Byte[65535];
            int bufLen = GetPrivateProfileString(Section, Key, Default, Buffer, Buffer.GetUpperBound(0), FileName);
            //必须设定0（系统默认的代码页）的编码方式，否则无法支持中文
            string s = Encoding.GetEncoding(0).GetString(Buffer);
            s = s.Substring(0, bufLen);
            return s.Trim();
        }
        //读整数
        public int ReadInteger(string Section, string Key, int Defalut)
        {
            string intStr = ReadString(Section, Key, Convert.ToString(Defalut));
            try
            {
                return Convert.ToInt32(intStr);
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
                return Defalut;
            }
        }
        //写整数
        public void WriteInteger(string Section, string Key, int Value)
        {
            WriteString(Section, Key, Value.ToString());
        }
        //读布尔值
        public bool ReadBool(string Section, string Key, bool Default)
        {
            try
            {
                return Convert.ToBoolean(ReadString(Section, Key, Convert.ToString(Default)));
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
                return Default;
            }
        }
        //写Bool
        public void WriteBool(string Section, string Key, bool Value)
        {
            WriteString(Section, Key, Convert.ToString(Value));
        }
        //从Ini文件中，将指定Section下的Key值添加到列表中
        public void ReadSection(string Section, StringCollection Keys)
        {
            Byte[] Buffer = new Byte[16384];
            //Keys.Clear();
            int bufLen = GetPrivateProfileString(Section, null, null, Buffer, Buffer.GetUpperBound(0), FileName);
            GetStringsFromBuffer(Buffer, bufLen, Keys);
        }
        private void GetStringsFromBuffer(Byte[] Buffer, int bufLen, StringCollection Strings)
        {
            Strings.Clear();
            if (bufLen != 0)
            {
                int start = 0;
                for (int i = 0; i < bufLen; i++)
                {
                    if ((Buffer[i] == 0) && ((i - start) > 0))
                    {
                        string s = Encoding.GetEncoding(0).GetString(Buffer, start, i - start);
                        Strings.Add(s);
                        start = i + 1;
                    }
                }
            }
        }
        //从Ini文件中，读取所有Section
        public void ReadSections(StringCollection SectionList)
        {
            //Note:必须得用Bytes来实现， StringBuilder只能取到第一个section
            byte[] Buffer = new byte[65535];
            int bufLen = 0;
            bufLen = GetPrivateProfileString(null, null, null, Buffer, Buffer.GetUpperBound(0), FileName);
            GetStringsFromBuffer(Buffer, bufLen, SectionList);
        }
        //读取指定Section下的所有value值到列表中
        public void ReadSectionValues(String Section, NameValueCollection Values)
        {
            StringCollection KeyList = new StringCollection();
            ReadSection(Section, KeyList);
            Values.Clear();
            foreach (string key in KeyList)
                Values.Add(key, ReadString(Section, key, ""));
        }
        //读取指定Section下的value到列表中、
        //public void ReadSectionValues(string Section, NameValueCollection Values, char splitString)
        //{
        //    string sectionValue;
        //    string[] sectionValueSplit;
        //    StringCollection KeyList = new StringCollection();
        //    ReadSection(Section, KeyList);
        //    Values.Clear();
        //    foreach(string key in KeyList)
        //    {
        //        sectionValue = ReadString(Section, key, "");
        //        sectionValueSplit = sectionValue.Split(splitString);
        //        Values.Add(key, sectionValueSplit[0].ToString(), sectionValueSplit[1].ToString());
        //    }
        //}
        //清除某个Section
        public void EraseSection(string Section)
        {
            if (!WritePrivateProfileString(Section, null, null, FileName))
                throw (new ApplicationException("无法清除Ini文件中的Section"));
        }
        //删除指定键
        public void DeleteKey(string Section, string Key)
        {
            WritePrivateProfileString(Section, Key, null, FileName);
        }
        //Note:对于Win9X来说需要实现UpdateFile方法将缓冲中的数据写入文件。
        //在Win NT, 2000和XP上都是直接写文件，没有缓冲，所以，无需实现UpdateFile
        //执行完对Ini文件的修改之后，应该调动本方法跟新缓冲区
        public void UpdateFile()
        {
            WritePrivateProfileString(null, null, null, FileName);
        }
        //检查指定section下是否存在某个键
        public bool ValueExists(string Section, string Key)
        {
            StringCollection Keys = new StringCollection();
            ReadSection(Section, Keys);
            return Keys.IndexOf(Key) > -1;
        }
        //确保资源的释放
        ~IniFiles()
        {
            UpdateFile();
        }
    }
}